staging: r8188eu: remove rtw_vmalloc preprocessor definition

Remove rtw_vmalloc preprocessor definition from include/osdep_service.h
as it now has no callers.
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210818234853.208448-3-phil@philpotter.co.ukSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/osdep_service.h

@@ -173,7 +173,6 @@ extern unsigned char RSN_TKIP_CIPHER[4];
 #define rtw_update_mem_stat(flag, sz) do {} while (0)
 u8 *_rtw_vmalloc(u32 sz);
 u8 *_rtw_zvmalloc(u32 sz);
-#define rtw_vmalloc(sz)			_rtw_vmalloc((sz))
 #define rtw_zvmalloc(sz)			_rtw_zvmalloc((sz))
 
 void *rtw_malloc2d(int h, int w, int size);